Water initially at 100 kPa and 25°C is compressed to 6 MPa and 25°C. Determine the change of enthalpy, in kJ/kg. Report your result to the nearst whole number using rounding. Assume that the density of the water is 997 kg/m3.

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.